Q: How do I register a license?
A: Licenses are automatically registered in Plesk:
Registration is done automatically - all you have to do is to install your (extension) license in Plesk, and open the Email Migration extension. Your license will now be registered. You can now go to the Tab License list, there you can see all your registered licenses. Note - only licenses valid for the "Email Migration Extension" can be registered. Other licenses will not be recognized.